Tackle-block



- G. HILGERS.

TACKL; BLOCK.

UNITED STATES GERRIT HILGERS, OF ROTTERDAM, NETHERLANDS.

TAGKLE-BLOCK.

Specification of Letters Patent.

Application led October 17, 1919.' Serial No. 331,418.

To all whom t may concern.'

Be it known that I, Gnnnrr HILGERS, subject of the Queen of the Netherlands, residing at Rotterdam, Netherlands, Bothastraat 23B, have invented certain new and useful improvements in Tackle-Blocksg and I do hereby` declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improvement in tackle blocks in which at least one of the pulleys has rigidly fixed to it a ratchet Wheel adapted to be engaged by a spring-pressed pawl pivoted to the body or frame of the block the arrangement being such that the said pulleyis prevented from rotating in a lowering direction so that to lower a load the rope must slide over the non-rotating pulley, a cord or the like being so connected to the pawl that by pulling the same the pawl can be raised in ,order to free the pulley. f

The object of the present invention is to provide an improvedv construction in which the mechanism is entirely inclosed in the pulley of the ordinary width and whereby. all springs are avoided. The known sheaves of existingtackle blocks and the like may therefore simply be replaced by the sheaves according to the invention without any further alteration of the'tackle being necessary.

In the accompanying drawings Figure 1 is a section of a sheave according to the invention, corresponding yto the line AB of Fig. 2.

Fig. 2 is a sectional view of the sheave corresponding to the line C, D of Fig. 1.

Fig. 3 is a side view of the sheave with the side ring removed. Y

The member` or boss 1 of the sheave through which the bolt 2 passes has the same width as the sheave and consists of a4 cylindrical part 3 and a llange 4 provided with teeth 5, while at the same side as the flange 4, the member terminates in a short cylindrical part 6. Around the cylindrical part 3 are located rollers 7 inclosed by the hub 8 of the pulley. Said rollers are locked in the sheave by means of a ange 9 of the hub 8.

At the opposite side of the sheave s. side ring 11 of the same width as the cylindrical part 6 of the member 1 is secured which ring closes off the flange or ratchet wheel 4 and at the same time shuts off the pawls 12` and 13 which are provided with cylindrical parts or pivots 14 and 15 which are located in cylindrical recesses in the hub of the sheave -in such a manner that the parts orpivots 14 and` 15 are for the greater part inclosed,

rby the portions 16 and 17, Fig. 3, of the hub 8, allowing the pawls to turn about the cylindricalparts or pivots 14 and 15. The pawls are provided with weights 18 and 19 vwhich move the pawls into contact with the teethV of the ratchet wheel 4 when the pawl is above the horizontal plane through bolt 2. One of the two pawls will therefore always 'be in engagement.

It will be seen 'that the construction i very simple and reliable as springs are avoided while the mechanism is totally inclosed in the sheave so that access of sea water and moisture is prevented as much as posslble.

It will be readily understood that the.

sheave can rotate in the direction of the arrow in Fig. 3 while it cannot rotate in the opposite direction as the member 1 on the bolt 2 cannot rotate.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is,:-`

.1. A pulley1 comprising a fixed sleeve pro-l Patented Oct. 19, 1920.y

2. A pulley, comprising a fixed sleeve having adjacent one end a flange provided with ratchet teeth on its periphery, a pulley mounted to turn on the sleeve and having in its hub an annular recess closed by thek flange of the sleeve, rollers in the said recess and engaging the sleeve, Vweighted pawls mounted on the hub for alternately engaging the ratchet teeth, and a ring fitting on the end of the sleeve and secured to the pulley over the pawls.

GERRIT HILGERS. 

